Chang' e II data! ! ! Urgent! urgent!

20 10 September 29th. It will ignite in xichang satellite launch center at 10, 1, 18: 59: 57 and take off at 19: 00 on time. If it can't be launched in the first window time due to weather and other reasons, we also choose to launch it on1October 2nd and 3rd, 65438. 20 10, 10, 1, 18: 59, 57 seconds and 345 milliseconds, Chang 'e II was successfully ignited, and the launch time was 19: 00. 29 minutes and 53 seconds after the flight, the star and arrow separated and the satellite entered orbit. 19: 56, the solar panel was successfully launched. At present, it has flown into the designated orbit.

According to the staff of the launch center, Chang 'e II will eventually be launched from Tower 2. On 26th, xichang satellite launch center's mobile launch tower began to move closer to the No.2 fixed launch tower. A spokesman for China's lunar exploration project officially announced today that Chang 'e II will be launched to the moon in xichang satellite launch center on June 10 18: 59: 57, starting a trip to the moon.

The main task of "Chang 'e II" is to obtain clearer and more detailed image data of the lunar surface and the surface data of the lunar polar region.

The resolution of CCD camera on this satellite will be higher, and other detection equipment will be improved. In order to realize the soft landing of Chang 'e-3, some key technical experiments were carried out, and the landing area of Chang 'e-3 was imaged with high precision.

165438+1October 6, CCTV news reported at 30: 00 that China's self-developed Chang 'e-2 satellite has entered the prototype development stage and will be fixed on the launch tower at 20 10.

Launched in 2008. The second phase of Chang 'e project has also been formally established, and it is planned to launch China's lunar lander and lunar rover around 20 12. Chang 'e-2, like Chang 'e-1 satellite, mainly flies around the moon, so the satellite weighs about 2 tons. Because the contents and purposes of the two satellites are different, the developers have adjusted the payload used in scientific exploration experiments. China's lunar exploration project will be completed in three phases, and it is necessary to break through the three key technologies of "winding", "falling" and "returning". [ 1] [ 1]

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On September 9, 2065438+00, the State Bureau of Science, Technology and Industry for National Defense revealed that the second phase of China's lunar exploration project "Chang 'e II" mission was progressing smoothly, and the preparations for the five major systems, such as Chang 'e II satellite and Long March III C carrier rocket, were basically ready, and pre-launch test preparations were being carried out. The test flight mission is planned to be implemented before the end of this year. The four scientific tasks of Chang 'e-1 are to observe the surface of the moon and obtain three-dimensional images. Second, detect the elements on the surface of the moon that can be used by human beings. Third, study the thickness and soil characteristics of the lunar surface soil. Fourth, measure the earth space and the moon space. This Chang 'e II also has four scientific goals. Preparing for the future Chang 'e III is different from Chang 'e I.. Chang 'e-2 probe is the forerunner of the second phase of the next Chang 'e project, preparing for the next soft landing patrol and testing some key technologies. From the engineering goal, Chang 'e II was directly sent to the moon orbit for the first time. Chang 'e-1 was not capable enough, because the Long March 3A rocket was used at that time. It is not enough to put Chang 'e-1 into orbit directly. First, it goes around the earth. The perigee is less than 380 thousand kilometers, and the perigee is only over 50 thousand kilometers. The apogee of the orbit increased bit by bit by Chang 'e-1' s own propeller and energy, and finally reached 380,000 kilometers. This is Chang 'e I. The strength of the launch vehicle has increased this time. What's the difference between Long March 3 C and Long March 3 A? Two boosters were added under the Chang 'e III A rocket, and the thrust was even greater. It can directly send about 2.3 tons of Chang 'e II into the moon-running orbit without circling the earth, and push it to about 200 kilometers at a time. At this time, the speed required to run to the moon reaches 10.8 per second. This is different from Chang 'e-1. Chang 'e II was sent directly into the lunar orbit by a carrier rocket.

Comprehensive exercise

20 10 On September 25th, the "Chang 'e II" lunar exploration satellite completed the third synthesis exercise before launch, which means that Chang 'e II launched the Long March III C rocket with the Chang 'e II satellite.

Enter the countdown 1 01October1,Chang 'e II is expected to start a trip to the moon. Yesterday, the reporter was allowed to enter xichang satellite launch center and got in touch with Chang 'e II "Zero Distance". At present, relevant experts are making final preparations for the launch. Xichang satellite launch center is about 60 kilometers away from Xichang. The reporter drove for nearly an hour and passed through many checkpoints to reach the launch platform, the core venue for the launch. "Yesterday afternoon, the launch base had already conducted the third synthetic exercise before the Chang 'e II lunar exploration. All the pre-launch inspections and debugging have been completed, and now we are waiting to refuel the rocket. "A staff member at the scene told the reporter that Chang 'e II has entered the countdown, and it is expected to be launched this week if the weather permits. The Chang 'e-2 satellite rocket, which has been tested three times, has been transferred to the No.2 fixed platform and entered the standby state. Once the launch is decided, the Chang 'e-2 satellite rocket will be quickly transferred from the platform to the tower for ignition and launch. "The staff said that in order to let more people enjoy the perfect launch of Chang 'e II on the spot, the relevant departments set up an on-site observation point 3 kilometers away from the launch platform," which can accommodate more than 1000 people. " According to reports, the flight procedure of "Chang 'e II" is similar to that of "Chang 'e I". The key is that its working orbit is 200 kilometers. This time, it is planned to reduce it to 100 km, so that the moon can be seen more clearly, and its flight time to the moon will be shorter than that of Chang 'e-1, and it is estimated that it will reach the lunar orbit in less than 5 days.

Filled fuel

The launch date of three Roy satellites in the Pacific Ocean waiting for the launch of Chang 'e-2 satellite is approaching. The reporter learned yesterday that all three Roy satellite survey vessels, which undertake the task of satellite maritime monitoring and control, have arrived at the scheduled sea area, and all the preparations have been properly deployed. At the same time, China Satellite Maritime Monitoring and Control Department has also formulated thousands of emergency plans. At present, Roy's survey fleet is waiting for the launch of Chang 'e-2 satellite in the Pacific Ocean. Three satellite survey vessels, Wangyuan No.3, Wangyuan No.5 and Wangyuan No.6, belong to China Satellite Maritime Monitoring and Control Department. After dozens of days of sailing, these three ships have reached the scheduled sea area in the Pacific Ocean. After the launch of the satellite, the entire Roy Fleet will undertake a series of important tasks such as the deployment of solar panels of Chang 'e-2 satellite, satellite state switching and monitoring, and Wangyuan-5 space survey ship.

More than 100 technical improvements were made at the launch site to welcome Chang 'e II. Tao Zhongshan, chief engineer of xichang satellite launch center, China, said on 28th that in order to welcome the upcoming Chang 'e II launch, xichang satellite launch center has made more than 100 technical improvements, further improving the reliability and overall launch capability of the launch site. Tao Zhongshan said that after the successful launch of China's first lunar exploration satellite, Chang 'e-1, the launch site system has reformed related equipment and facilities, including updating the measuring radar, updating the telemetry system, transforming optical instruments and optimizing the filling system. During this period, xichang satellite launch center successfully launched 10 times, sending a series of navigation satellites, meteorological satellites, communication satellites and radio and television satellites into space. Tao Zhongshan said that these launches have further enriched the experience of the launch site staff and greatly promoted the program optimization, post optimization and personnel training. In addition, the center has passed the certification of two national standards of environment and occupational health and safety, and passed the certification of ISO900 1 international quality management system again in 2009.

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"zero window" start

When Chang 'e-1 satellite was launched in 2007, "zero window" was always one of the key words. The so-called "zero window" means that the rocket is ignited and lifted off every minute within the pre-calculated launch time, and no delay or change is allowed. There is almost no room to adjust the launch time of the rocket when it is launched in the "zero window". Usually, the rocket ignition is controlled every once in a while to realize the "zero window" launch. If the rocket can't be launched on time, it will be delayed, waiting for the next launch window, or even delayed for one or several days. Therefore, "zero window" launch puts forward higher requirements for rocket reliability. Zhao Xiaojin, director of the space department of China Aerospace Science and Technology Corporation, told the media before the launch of Chang 'e-1 satellite that the launch window of Chang 'e-1 was reserved for 35 minutes, during which it could be launched. However, compared with the first minute launch, the last minute launch will lose 1.20 kg of satellite fuel, which is a great loss for Chang 'e-1, which only has 1.200 kg of fuel in total, and will directly affect its working time and service life. If we can't launch normally within 35 minutes due to special reasons, we can only cancel the launch plan and postpone the launch window to next year.

Nine conditions

The Science and Technology Daily reporter learned from the website of China Academy of Launch Vehicle Technology that the launch window of early rockets was determined according to optical observation conditions, and the launch time was generally chosen in the early morning or evening. At this time, the sun is on the horizon, and the sun can shine on the rocket, while the earth is in a relatively dark environment, resulting in great contrast, which forms a good optical observation condition for the optical measurement and research of rocket flight. After the appearance of application satellites, the requirements of satellites for launching conditions are more complicated, and optical observation conditions become extremely secondary conditions. Because of the different functions and uses of satellites, all kinds of satellites have different requirements for launch conditions of launch vehicles and corresponding launch windows. Generally speaking, the launch window mainly has the following constraints: (1) the illumination conditions of the ground targets (such as meteorological and resource satellites) when the sun flies; Relative relationship between satellite solar panels and solar rays (requirements of solar cell power supply); The geometric relationship among the Earth, the satellite and the sun required by the satellite attitude measurement accuracy; Satellite temperature control requires that the sun can only illuminate some directions of the satellite; Requirements for the length of time the satellite is in the shadow of the earth (requirements for solar cell power supply); Requirements for landing recovery time (such as recoverable satellites and manned spacecraft). ); Specific requirements for satellite orbital plane (such as mobile communication satellite constellation, orbital rendezvous, orbital interception, etc.). ); Requirements for the relative position of the earth and the target celestial bodies (such as lunar probes, planetary probes, etc.). ); Others such as ground tracking measurement conditions, meteorological conditions, etc. Determining the launch window is actually to determine the relative position of the flight orbit and a specific object (such as the sun, the moon, the rendezvous object, etc.). According to the constraint conditions, you can also choose the appropriate launch environment conditions.

Emission window law

According to various constraints, the launch windows of various satellites also have their own laws. Resource satellite, photographic reconnaissance satellite, medium orbit meteorological satellite, etc. It is required that the ground target area has good lighting conditions, and the launch window should be selected during the day. Manned spacecraft should not only observe the earth, but also return to the landing site during the day, so the launch window is also during the day, and its width is limited by attitude measurement and temperature control. In addition, the meteorological conditions of the satellite operation area and the manned spacecraft landing site are also factors that need to be considered in the launch window. The launch window of geosynchronous satellites (including geosynchronous communication satellites and geosynchronous meteorological satellites, etc.). ) mainly depends on the sun angle, earth shadow, sun-earth angle, ground measurement and other constraints, so it is related to the sun position, satellite attitude, orbit, satellite control mode (spin stabilization mode or three-axis stabilization mode), orbit change mode, satellite layout form and ground station position. Even if the orbits of different satellites are the same, the launch windows may be quite different. Generally speaking, due to the long range of the rocket launching section when launching a geosynchronous satellite, the angle between the meridian plane where the launching point is located and the main axis of the transfer orbit (the connection between perigee and apogee) is large, and the satellite orbit transfer operation is carried out at the apogee of the transfer orbit. If the apogee is to be in the daytime environment and meet the constraints of the sun angle and the sun-earth angle, then the launch of geosynchronous satellites will be carried out at night. The emission window width is usually about 1 hour. For satellite constellation, orbit rendezvous, orbit interception and other launch tasks, the launch time is more strict because the satellite is required to be sent to the predetermined orbit plane in inertial space. The launch time is determined by the direction of the orbital plane in the inertial space (the declination of the ascending intersection of the orbit), and it is possible within 24 hours a day. The width of the emission window depends on the error requirements of the track surface. The launch window of the lunar probe and planetary probe mainly depends on the position of the target celestial body (moon or planet), and the launch must be carried out within a certain relative position range between the earth and the target celestial body. If the relative position between the earth and the target celestial body changes after this miss, the launch orientation or flight trajectory of the rocket should be adjusted accordingly. Chang 'e II successfully entered the orbit around the moon at 1 1: 06 Beijing time. Under the precise control of Beijing Aerospace Control Center, Chang 'e II successfully braked for the first time in recent months. After 32 minutes, the satellite successfully entered the elliptical orbit around the moon, with a period of about 12 hours. TT&C, deputy commander of Chang 'e-2 mission, and Ma Yongping, communication commander and deputy director of Beijing Aerospace Control Center, said that braking in recent months is the most critical orbit control during the satellite flight. When Chang 'e-2 satellite flew close to the moon, its speed relative to the moon was greater than its escape speed. If it does not slow down, the satellite will fly away from the moon. In order to fly around the moon, it is necessary to brake to reduce its flight speed to less than the escape speed of the moon, so that it can be captured by the moon's gravity and become a moon satellite. 1 1: 06, Beijing Aerospace Control Center dispatches the ground measurement and control system, sends instructions to Chang 'e II, and the satellite engine ignites on time. Shut down normally after working for 32 minutes. The analysis and calculation results of various measurement data show that the satellite successfully entered the elliptical orbit around the moon with a period of about 12 hours. According to reports, compared with Chang' e-1 satellite, Chang' e-2 is closer to the surface of the moon, with faster speed and more braking. At the same time, the perturbation effect of lunar gravity field on satellite orbit increases correspondingly, which further affects the accuracy of orbit prediction, orbit control and rapid orbit determination after recent moon capture. This puts forward higher requirements for the satellite control ability and measurement accuracy of the measurement and control system. The successful braking in recent months has laid a solid foundation for Chang 'e II to finally enter the "mission orbit" for scientific exploration activities, and further verified the "precise lunar orbit determination" technology of China Aerospace TT&C, marking a new improvement in the TT&C level of China Aerospace. It is reported that Beijing Aerospace Control Center will carry out an orbital plane maneuver and two braking in recent months on Chang 'e-2 satellite in the near future to ensure that the satellite enters the "mission orbit" with a period of 1 18 minutes. After the satellite passes the on-orbit test, it will carry out scientific exploration activities.

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Up to now, there have been 127 lunar exploration activities in the world, including 57 in the United States, 64 in the Soviet Union, 2 in Japan and China, and/kloc-0 in ESA and India. The above success or basic success was 64 times, and the failure was 63 times, with a success rate of 50%. From 1958 to 1976, the United States launched seven series of 54 detectors: pioneer series (5 launches, 1 success), rover series (9 launches, 3 successes), lunar orbiter series (5 successful launches) and surveyor series (7 launches, 5 successes) The Japanese goddess of the moon was launched.

From 1958 to 1976, the Soviet Union launched four series of 64 lunar probes: lunar series (43 launches, 24 successes), probe series (14 launches, 5 successes), "Cosmos" series (6 launches, all failures) and Alliance L3. Since 1990s, more countries have made seven lunar explorations: 1990 65438+ 10. In October, Japan launched the Tian Fei lunar orbiter, becoming the third country to launch a lunar probe. Tian Fei lost contact with the ground after approaching the moon, and no detection results were obtained. 1994 65438+ 10, the United States launched the Clementine lunar orbiter to draw the digital topographic map of the lunar surface and sent back10.8 million pictures. 1998 65438+ 10, the United States launched the lunar explorer orbiter for remote sensing detection, and in July of the same year, it hit the moon to find evidence of water ice on the moon. In September 2003, ESA launched the first lunar probe Smart- 1, which successfully completed the expected lunar exploration mission with a solar ion engine and crashed into the moon in September 2006. In September 2007, Japan's "SELENE" lunar orbiter was successfully launched. In June 2009, Chang 'e was controlled to hit the moon, ending a two-year exploration mission. June 5438+October 2007 10, China's Chang 'e-1 was launched, successfully completing the scheduled exploration mission, and was controlled to hit the moon in March 2009. June 5438+October 2008 1, India's "Moon Ship1"successfully launched a satellite orbiting the moon, which imaged the moon globally and carried out mineral and chemical mapping. In August 2009, "Moon Ship 1" lost contact with the ground after working in orbit for 3 12 days. In June 2009, the United States launched the Lunar Reconnaissance Orbiter (LRO) and the Lunar Crater Observation and Remote Sensing Satellite (LCROSS). On June 9, 65438, LCROSS successfully hit the moon and found water. LRO is still working in orbit. 20 10 10 In June, China's Chang 'e II was launched, and the follow-up work is in progress. Indian moon ship 1 launched.

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Huang Jiangchuan, chief engineer of satellite system

Chief engineer of Zhou launch site system

The Bureau of Science and Technology for National Defense said that considering China's scientific and technological level, comprehensive national strength and overall national development strategy, before 2020, China's lunar exploration project will be mainly unmanned and divided into three implementation stages. "Orbit": From 2004 to 2007 (Phase I), China's first lunar exploration satellite was developed and launched to carry out lunar exploration. The main task at this stage is to develop and launch a lunar exploration satellite, break through the key technologies of lunar exploration, conduct overall, integrated and comprehensive exploration on the lunar topography and mantle, some elements and material components, lunar soil characteristics and the space environment between the Earth and the Moon, and initially establish China's lunar exploration space engineering system. "Landing": around 20 13 (Phase II), the first lunar soft landing and automatic patrol survey were conducted. The main task is to break through the key technologies such as lunar soft landing, lunar patrol survey, TT&C communication and remote control operation in deep space, launch of launch vehicle for deep space exploration, develop and launch lunar soft landing detectors and patrol detectors, realize lunar soft landing and patrol detection, detect the topography, geological structure and material composition of the landing area, and carry out moon-based astronomical observation. "Return": Before 2020 (Phase III), the first lunar sample will be automatically sampled and returned for detection. The main task is to break through the sampling return detector, small sampling return cabin, lunar surface rock drill, lunar surface sampler, robot manipulator and other technologies; On the basis of field analysis and sampling, collect key samples and return them to earth for laboratory analysis and research; Deepen the understanding of the origin and evolution of earth-moon system. Only after "circling", "falling" and "returning" are successfully realized can the next man's moon landing plan be carried out.

Chang 'e III is expected to be launched in Wenchang.

The land acquisition of Wenchang Space Launch Center was officially launched, and Chang 'e III is expected to be launched in Wenchang. This morning, Wenchang Municipal Party Committee and Municipal Government held a preliminary land acquisition ceremony. A total of 18 land acquisition teams in the city went to Longlou Town and Dongjiao Town to conduct a thorough land survey, and will determine the final land acquisition plan within half a year to prepare for the smooth operation of the space launch center. Land acquisition will be carried out in accordance with the principle of "harmonious land acquisition and voluntary demolition", and the vital interests of local people will be fully considered while ensuring the overall situation of the country. It is understood that after the land acquisition is completed, the transferred local people will be properly resettled near the space launch center, and the government will invest in building houses and paving roads for the people, and train the people who have the ability to work to ensure their normal life, production and development. Another reporter learned from the relevant departments that the Wenchang Space Launch Center is expected to launch Chang 'e III after its completion. By then, Wenchang and Hainan people will have the honor to witness this historical moment.

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The Xichang launch site sounded an evacuation alarm 1 hour before the satellite launch, and all the people in the site would be evacuated to 2.5 kilometers away. According to the latest weather forecast, the rain in the launch area will be around 8 pm, which will not hinder the rocket launch. It was successfully launched on 10, 10, 1, 18: 59: 57. After the launch of Chang 'e II, it passed through Sichuan, Chongqing, Jiangxi, Hunan, Fujian and Taiwan Province provinces, and successfully rose into space in 1500 seconds. Public trust. Com Suichuan 10.2 (He Gang Ming Hua Shan) 10.2 in the morning, reporter from Zhongxin. com. Com learned from suichuan county, Ji 'an City, Jiangxi Province that the fairing of Chang 'e II satellite was at 19: 00 1 1. The satellite fairing crashed in Nanping Village and Hengzhen Village, Tanghu Town, Tea Town, suichuan county respectively. A large pit was dug from a farmland at 1 km north of Tanghu Town Government, with a depth of1.5m; The other is 7 kilometers away from Hengzhen, the town government. According to Zhang, deputy director of the Armed Forces Department who was on duty at Tanghu Town Government at that time, there were two loud noises around 1 1 9: 00 that night, and there was a strong earthquake several kilometers around. The local people looked along the direction of the sound and found two fairings respectively, and immediately reported to the town government. After receiving the accurate report from the masses, the armed forces department of Tanghu Town immediately launched the emergency plan and reported it to the superior. At the same time, send militia to the scene to maintain order, waiting for the higher authorities to recover. As the falling points of the satellite fairings were all located in farmland, no casualties were caused. It is understood that since June this year, three satellite fairings of Beidou-4, Sinosat-6 and Chang 'e-2 have successively landed in suichuan county. (End)

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The goal of "flying to the moon"

[7] Chang 'e-2 satellite was technically improved and adapted on the basis of the backup satellite Chang 'e-1, the first lunar exploration satellite in China. Its main goal is to achieve a soft landing on the lunar surface for Chang 'e-3, the second phase of China's lunar exploration project, to verify some key technologies, to carry out high-resolution imaging of the pre-selected Hongwan landing area of Chang 'e-3, and to continue to carry out lunar scientific exploration and research. The Long March 3C carrier rocket with two boosters is a series of China Long March 3A carrier rockets. In this space launch, the mission of the "Long March 3C" carrier rocket is to send Chang 'e-2 satellite into a direct orbit around the moon with a perigee height of 200 kilometers and an apogee height of about 380,000 kilometers. [8]

Chang 'e II successfully separated the star and arrow.

Chang 'e II successfully separated the star from the arrow at Beijing time1October 10/9: 26, and launched the solar array at 19: 56.

Chang 'e II sent back an imaging photo of the earth and the moon.

At about 3: 39 a.m. on October 2nd, 65438/KLOC-0, Beijing time, after a series of attitude adjustments, Chang 'e II took the first photographic work with its own surveillance camera, which is the ground imaging in the aforementioned "Earth-Moon Imaging". At 8: 49 am on the 2nd, with the transmission of the first set of satellite data, this image of the earth has also been sent back and will be released soon.

Chang 'e II successfully implemented the first mid-course correction of orbit.

Beijing time1October 2 12: 25, the password sounded in the lobby of Beijing Aerospace Control Center on time, and Chang 'e-2 satellite began its first mid-course correction as planned. Due to the influence of orbit deviation, gravity, cosmic environment and other factors, Chang 'e-2 satellite needs to choose a suitable time to change its orbit halfway and correct its course during its 380,000-kilometer journey to the moon, especially in the long earth-moon transfer orbit, in order to successfully set foot on the orbit around the moon near 100 km. Three hours later, Beijing Flight Control Center has obtained the measurement and control data for the first time. The queen, director of the flight control center office, came to confirm that the first mid-course correction of Chang 'e II was successful. Separation of Chang 'e II Star and Arrow

Chang 'e II cancelled the second orbit correction.

Because the first mid-course correction of Chang 'e-2 satellite was very effective and the satellite was running normally, the second mid-course correction originally planned at noon yesterday was cancelled. According to experts, the goal of mid-course orbit change is to reduce the speed increment of the satellite in the original orbit and control the increment below 10 meter per second. According to the figures on the afternoon of the 2nd, the speed increment is less than per second 1 meter. According to reports, Chang 'e-2 satellite originally planned to make three orbital corrections. Since the initial goal has been achieved in the first correction, the second correction is unnecessary. In the next few days, we need to choose the opportunity to make the third revision. The purpose is to adjust the speed of the satellite to the moon point of 100 km, so midway correction is the basis of "braking" in this key space. It is understood that the time from the launch of Chang 'e-2 satellite to its arrival at the moon 100 km is about 5 days.

Chang 'e II cancelled the third orbit correction.

Zhu, director of the Beijing Aerospace Control Center, told the reporter on the 5th that the first mid-course orbit change met the requirements of orbit entry accuracy, and the mid-course orbit change in the Chang 'e-2 satellite plan was cancelled again. It is expected to enter the scheduled orbit around the moon on the 6th. According to Zhu, during the first mid-course orbit transfer on June 2nd, 10, Beijing Center established an accurate attitude control disturbance compensation model. After careful calculation and repeated review, the first mid-course orbit transfer of the satellite was successfully implemented. From the analysis of the revised orbit measurement calculation results, it is found that the control is very accurate and meets the accuracy requirements of the satellite reaching the braking point in the near month. Therefore, the two mid-course corrections originally planned for later were not carried out. This indicates that China's space orbit determination and control technology has reached an accurate level. Canceling the mid-course orbit change one after another will save some fuel for Chang 'e-2 satellite and provide more power support for the satellite to carry out lunar exploration in orbit around the moon.

Chang 'e II sent back the first batch of orbital data.

On the morning of June 6, 10/2 hours after flying on the road to the moon, "Chang 'e II" stepped on the brakes near the moon 100 km, and successfully implemented the first braking in recent months. This indicates that "Chang 'e II" has entered the orbit around the moon with a period of about 12 hours from the earth-moon transfer orbit. From the moon-chasing man to the moon-circling man, the girl Chang 'e completed the most crucial and gorgeous "transformation" after going straight to the ninth heaven. 10: 30, "Chang 'e II" stretched its muscles and began to warm up before braking-adjusting its posture. The satellite's 490-ox engine took 25 minutes to do a somersault in space to prepare for slowing down. At 1 1: 06: 35 in the morning, the flight control center of Beijing Aerospace City issued the first braking command, and "Chang 'e II" slowed down its galloping pace, and its running speed gradually dropped below 2.4 km/s. According to reports, the gravity of the moon is only one sixth of that of the earth. If the speed is fast, the satellite may fly away. If the speed is too slow, the satellite may hit the moon. 1942 seconds later, "Chang' e II" was captured by the moon and entered the orbit around the moon. It immediately shut down the engine of 490 Niu and returned to the cruising state. Tong Bin, the chief engineer, wept with joy when he saw the pink and green tracks completely overlapping on the big screen of the flight control center.

Wu Ji said that if the sun moves, you can't restrain it, but you can only resist it. There may be some temporary failures that affect the flight of the satellite, such as the satellite being forced to switch to safe mode.

Wu Ji said that if the sun breaks out, all satellites may fail.

What should we do if our satellite encounters a big solar storm in space? Wu Ji said that the best way is to shut it down as much as possible, leaving only the smallest system to maintain the survival of satellites, such as receiving signals. Everything else that can be turned off should be turned off until the solar storm has passed. Wu Ji said that the time of the solar eruption is basically predictable, because the solar eruption has a process from small to large, and when the material will erupt and whether it will come to the satellite can be predicted, with an accuracy rate of 70% to 80%.